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Method for recycling chlorine gas from HCl-containing exhaust gas and preparing manganese chloride, and manganese chloride crystals

A technology of tail gas recovery and manganese chloride, which is applied in the direction of manganese halide, can solve the problems of difficulty in tail gas reuse, secondary pollution of the environment, and difficulty in purification

Inactive Publication Date: 2014-01-22
GUIZHOU REDSTAR DEVING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the high impurity content of the hydrochloric acid product obtained by the existing HCl-containing tail gas treatment method and the secondary pollution of the environment, and to adopt manganese carbonate ore to prepare manganese chloride Ca and Mg with high impurities and difficult purification, etc. Defects provide A kind of tail gas that utilizes HCl to reclaim Cl 2 And prepare the method for manganese chloride, adopt the tail gas reduction manganese dioxide ore containing HCl, reclaim Cl 2 At the same time, high-purity manganese chloride is obtained, which solves the problems of difficult reuse of HCl-containing tail gas and difficult reduction and purification of high-valent manganese
In the present invention, the mother liquor obtained by solid-liquid separation in the crystallization step is added with reaction moles of NH 4 HCO 3 The reaction of solids solves the problem of cyclic enrichment of impurities in the system

Method used

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  • Method for recycling chlorine gas from HCl-containing exhaust gas and preparing manganese chloride, and manganese chloride crystals
  • Method for recycling chlorine gas from HCl-containing exhaust gas and preparing manganese chloride, and manganese chloride crystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Using low-grade MnO with a Mn content of 16.23wt% 2 Mineral powder is used as raw material, and it is formulated to have a solid content of 350Kg / m 3 of slurry. The tail gas containing HCl emitted in the production of sponge titanium is used as raw material. The tail gas mainly includes 14.71% (v / v) chlorine and hydrogen chloride, of which chlorine is about 3-4% (v / v).

[0058] In this embodiment, a three-stage absorption device is used, and the vent is sealed by water sealing with lime solution. Present embodiment process is as follows.

[0059] 1. Absorption of tail gas containing HCl

[0060] First pass the above-mentioned tail gas containing HCl into the first-stage circulation tank of the absorption device, and the average flue gas flow rate is 24000-27000Nm 3 / h, the gas-liquid volume ratio is controlled at 12L / Nm 3 . Then turn on the circulation pump, the above MnO 2 The slurry is pumped to the first, second and third circulation tanks of the absorption un...

Embodiment 2

[0069] Using medium-grade MnO with a Mn content of 24.04wt% 2 Mineral powder is used as raw material, and it is formulated to have a solid content of 300Kg / m 3 of slurry. The HCl-containing tail gas discharged from the sponge titanium industry is used as the raw material. The tail gas mainly includes 17.11% (v / v) chlorine and hydrogen chloride, of which chlorine is about 3-4% (v / v).

[0070] In this embodiment, a three-stage absorption device is used, and the vent is sealed by water sealing with lime solution. Present embodiment process is as follows.

[0071] 1. Absorption of tail gas containing HCl

[0072] First pass the above-mentioned tail gas containing HCl into the first-stage circulation tank of the absorption device, and the average flue gas flow rate is 24000-27000Nm 3 / h, the gas-liquid volume ratio is controlled at 13.5L / Nm 3 . Then turn on the circulation pump, the above MnO 2 The slurry is pumped to the first, second and third circulation tanks of the abso...

Embodiment 3

[0081] Using high-grade MnO with a Mn content of 41.45wt% 2 Mineral powder is used as raw material, and it is formulated to have a solid content of 300Kg / m 3 of slurry. The HCl-containing tail gas discharged from the sponge titanium industry is used as the raw material. The tail gas mainly includes 24.17% (v / v) chlorine and hydrogen chloride, of which chlorine is about 3-4% (v / v).

[0082] In this embodiment, a three-stage absorption device is used, and the vent is sealed by water sealing with lime solution. Present embodiment process is as follows.

[0083] 1. Absorption of tail gas containing HCl

[0084] In this embodiment, a three-stage absorption device is used, and the vent is sealed by water sealing with lime solution. First pass the above-mentioned tail gas containing HCl into the first-stage circulation tank of the absorption device, and the average flue gas flow rate is 24000-27000Nm 3 / h, the gas-liquid volume ratio is controlled at 15L / Nm 3 . Then turn on th...

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Abstract

The invention provides a method for recycling chlorine gas from HCl-containing exhaust gas and preparing manganese chloride, and manganese chloride crystals. The method comprises the following steps: 1. introducing HCl-containing exhaust gas into MnO2 pulp to carry out reaction, stopping the reaction when the pH value of the pulp reaches 1-2, wherein the concentration of MnCl2 in the pulp after the reaction is stopped is controlled at 100-300g / L, and meanwhile, the Cl2-containing gas after the reaction is recycled; 2. carrying out solid-liquid separation on the pulp obtained in the step 1 to obtain a first filtrate, adding manganese-containing alkali liquor into the first filtrate for neutralization until the pH value reaches 3-3.5, removing impurities, and filtering to obtain a second filtrate; and 3. crystallizing the second filtrate, and recrystallizing to obtain the MnCl2.4H2O product. The method can be used for preparing the manganese chloride product which satisfies the following condition required by a lithium ion secondary battery: on the basis of MnCl2.4H2O, the purity is higher than 99.71%.

Description

technical field [0001] The invention relates to a method for treating tail gas containing HCl, in particular to a method for recovering Cl by using tail gas containing HCl 2 And prepare the method for manganese chloride. Background technique [0002] Both the domestic sponge titanium industry and the organic chloride production industry emit a large amount of HCl-containing tail gas. In the prior art, the treatment method for the tail gas containing HCl is to make hydrochloric acid as a by-product, or to absorb the tail gas containing HCl with lye for treatment. However, both of the above two treatment methods have certain defects, such as the high content of impurities in the by-product hydrochloric acid, coupled with the seasonal demand for by-product hydrochloric acid, the environmental protection device cannot operate stably all year round; the absorption of lye will produce a large amount of low-concentration brine , thus causing secondary pollution to the environment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/06
Inventor 姜志光华东
Owner GUIZHOU REDSTAR DEVING
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